More than one Microsoft partition has been detected on your hard drive. Please choose the one which you want to resize in order to install your new Mageia operating system.
Each partition is listed as follows: "Linux name", "Windows name", "Capacity".
"Linux name" is structured: "hard drive type", "hard drive number", "partition number" (for example, "sda1").
This is standard for hard drives now and has nothing to do with SD Memory Cards. Hard drives were previously prefixed "hd" for IDE drives or "sd" for SATA drives but they are all now prefixed with "sd".
"Hard drive number" is actually a letter and always follows "sd":
"Windows name" is the letter of your hard drive under Windows® (the first disk or partition is called "C:").